The upgraded Pixel Detector of the ATLAS Experiment for Run 2 at the Large Hadron Collider
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- 作者：M. Backhaus malte.backhaus@cern.ch" class="auth_mail" title="E-mail the corresponding author ; on behalf of the ATLAS Collaboration
- 关键词：Detector design and construction technologies and materials ; Radiation-hard detectors ; Large detector systems for particle and astroparticle physics ; Particle tracking detectors (Solid-state detectors)
- 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- 出版年：2016
- 出版时间：21 September 2016
- 年：2016
- 卷：831
- 期：Complete
- 页码：65-70
- 全文大小：2803 K
文摘
During Run 1 of the Large Hadron Collider (LHC), the ATLAS Pixel Detector has shown excellent performance. The ATLAS collaboration took advantage of the first long shutdown of the LHC during 2013 and 2014 and extracted the ATLAS Pixel Detector from the experiment, brought it to surface and maintained the services. This included the installation of new service quarter panels, the repair of cables, and the installation of the new Diamond Beam Monitor (DBM). Additionally, a completely new innermost pixel detector layer, the Insertable B-Layer (IBL), was constructed and installed in May 2014 between a new smaller beam pipe and the existing Pixel Detector. With a radius of 3.3 cm the IBL is located extremely close to the interaction point. Therefore, a new readout chip and two new sensor technologies (planar and 3D) are used in the IBL. In order to achieve best possible physics performance the material budget was improved with respect to the existing Pixel Detector. This is realized using lightweight staves for mechanical support and a CO2 based cooling system.
This paper describes the improvements achieved during the maintenance of the existing Pixel Detector as well as the performance of the IBL during the construction and commissioning phase. Additionally, first results obtained during the LHC Run 2 demonstrating the distinguished tracking performance of the new Four Layer ATLAS Pixel Detector are presented.